/**
 * turn.js 3rd release
 * www.turnjs.com
 *
 * Copyright (C) 2012, Emmanuel Garcia.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *
 * 2. Any redistribution, use, or modification is done solely for personal 
 * benefit and not for any commercial purpose or for monetary gain.
 * 
 **/
 (function($) {

  'use strict';
  
  var has3d,
  
    vendor ='',
  
    PI = Math.PI,
  
    A90 = PI/2,
  
    isTouch = 'ontouchstart' in window,
  
    events = (isTouch) ? {start: 'touchstart', move: 'touchmove', end: 'touchend'}
        : {start: 'mousedown', move: 'mousemove', end: 'mouseup'},
  
    // Contansts used for each corner
    // tl * tr
    // *     *
    // bl * br
  
    corners = {
      backward: ['bl', 'tl'],
      forward: ['br', 'tr'],
      all: ['tl', 'bl', 'tr', 'br']
    },
  
    displays = ['single', 'double'],
  
    // Default options
  
    turnOptions = {
  
      // First page
  
      page: 1,
      
      // Enables gradients
  
      gradients: true,
  
      // Duration of transition in milliseconds
  
      duration: 600,
  
      // Enables hardware acceleration
  
      acceleration: true,
  
      // Display
  
      display: 'double',
  
      // Events
  
      when: null
    },
  
    flipOptions = {
  
      // Back page
      
      folding: null,
  
      // Corners
      // backward: Activates both tl and bl corners
      // forward: Activates both tr and br corners
      // all: Activates all the corners
  
      corners: 'forward',
      
      // Size of the active zone of each corner
  
      cornerSize: 100,
  
      // Enables gradients
  
      gradients: true,
  
      // Duration of transition in milliseconds
  
      duration: 600,
  
      // Enables hardware acceleration
  
      acceleration: true
    },
  
    // Number of pages in the DOM, minimum value: 6
  
    pagesInDOM = 6,
    
    pagePosition = {0: {top: 0, left: 0, right: 'auto', bottom: 'auto'},
            1: {top: 0, right: 0, left: 'auto', bottom: 'auto'}},
  
    // Gets basic attributes for a layer
  
    divAtt = function(top, left, zIndex, overf) {
      return {'css': {
            position: 'absolute',
            top: top,
            left: left,
            'overflow': overf || 'hidden',
            'z-index': zIndex || 'auto'
            }
        };
    },
  
    // Gets a 2D point from a bezier curve of four points
  
    bezier = function(p1, p2, p3, p4, t) {
      var mum1 = 1 - t,
        mum13 = mum1 * mum1 * mum1,
        mu3 = t * t * t;
  
      return point2D(Math.round(mum13*p1.x + 3*t*mum1*mum1*p2.x + 3*t*t*mum1*p3.x + mu3*p4.x),
              Math.round(mum13*p1.y + 3*t*mum1*mum1*p2.y + 3*t*t*mum1*p3.y + mu3*p4.y));
    },
    
    // Converts an angle from degrees to radians
  
    rad = function(degrees) {
      return degrees/180*PI;
    },
  
    // Converts an angle from radians to degrees
  
    deg = function(radians) {
      return radians/PI*180;
    },
  
    // Gets a 2D point
  
    point2D = function(x, y) {
      return {x: x, y: y};
    },
  
    // Returns the traslate value
  
    translate = function(x, y, use3d) {
      return (has3d && use3d) ? ' translate3d(' + x + 'px,' + y + 'px, 0px) ' : ' translate(' + x + 'px, ' + y + 'px) ';
    },
  
    // Returns the rotation value
  
    rotate = function(degrees) {
      return ' rotate(' + degrees + 'deg) ';
    },
  
    // Checks if a property belongs to an object
  
    has = function(property, object) {
      return Object.prototype.hasOwnProperty.call(object, property);
    },
  
    // Gets the CSS3 vendor prefix
  
    getPrefix = function() {
      var vendorPrefixes = ['Moz','Webkit','Khtml','O','ms'],
        len = vendorPrefixes.length,
        vendor = '';
  
      while (len--)
        if ((vendorPrefixes[len] + 'Transform') in document.body.style)
          vendor='-'+vendorPrefixes[len].toLowerCase()+'-';
  
      return vendor;
    },
  
    // Adds gradients
  
    gradient = function(obj, p0, p1, colors, numColors) {
    
      var j, cols = [];
  
      if (vendor=='-webkit-') {
      
        for (j = 0; j<numColors; j++)
            cols.push('color-stop('+colors[j][0]+', '+colors[j][1]+')');
        
        obj.css({'background-image': '-webkit-gradient(linear, '+p0.x+'% '+p0.y+'%,  '+p1.x+'% '+p1.y+'%, '+ cols.join(',') +' )'});
  
      } else {
  
        // This procedure makes the gradients for non-webkit browsers
        // It will be reduced to one unique way for gradients in next versions
        
        p0 = {x:p0.x/100 * obj.width(), y:p0.y/100 * obj.height()};
        p1 = {x:p1.x/100 * obj.width(), y:p1.y/100 * obj.height()};
  
        var dx = p1.x-p0.x,
          dy = p1.y-p0.y,
          angle = Math.atan2(dy, dx),
          angle2 = angle - Math.PI/2,
          diagonal = Math.abs(obj.width()*Math.sin(angle2)) + Math.abs(obj.height()*Math.cos(angle2)),
          gradientDiagonal = Math.sqrt(dy*dy + dx*dx),
          corner = point2D((p1.x<p0.x) ? obj.width() : 0, (p1.y<p0.y) ? obj.height() : 0),
          slope = Math.tan(angle),
          inverse = -1/slope,
          x = (inverse*corner.x - corner.y - slope*p0.x + p0.y) / (inverse-slope),
          c = {x: x, y: inverse*x - inverse*corner.x + corner.y},
          segA = (Math.sqrt( Math.pow(c.x-p0.x,2) + Math.pow(c.y-p0.y,2)));
  
          for (j = 0; j<numColors; j++)
            cols.push(' '+colors[j][1]+' '+(( segA + gradientDiagonal*colors[j][0] )*100/diagonal)+'%');
      
          obj.css({'background-image': vendor+'linear-gradient(' + (-angle) + 'rad,' + cols.join(',') + ')'});
      }
    },
  
  turnMethods = {
  
    // Singleton constructor
    // $('#selector').turn([options]);
  
    init: function(opts) {
  
      // Define constants
      if (has3d===undefined) {
        has3d = 'WebKitCSSMatrix' in window || 'MozPerspective' in document.body.style;
        vendor = getPrefix();
      }
  
      var i, data = this.data(), ch = this.children();
    
      opts = $.extend({width: this.width(), height: this.height()}, turnOptions, opts);
      data.opts = opts;
      data.pageObjs = {};
      data.pages = {};
      data.pageWrap = {};
      data.pagePlace = {};
      data.pageMv = [];
      data.totalPages = opts.pages || 0;
  
      if (opts.when)
        for (i in opts.when)
          if (has(i, opts.when))
            this.bind(i, opts.when[i]);
  
  
      this.css({position: 'relative', width: opts.width, height: opts.height});
  
      this.turn('display', opts.display);
  
      if (has3d && !isTouch && opts.acceleration)
        this.transform(translate(0, 0, true));
    
      for (i = 0; i<ch.length; i++)
        this.turn('addPage', ch[i], i+1);
    
      this.turn('page', opts.page);
  
          // allow setting active corners as an option
          corners = $.extend({}, corners, opts.corners);
  
      // Event listeners
  
      $(this).bind(events.start, function(e) {
        for (var page in data.pages)
          if (has(page, data.pages) && flipMethods._eventStart.call(data.pages[page], e)===false)
            return false;
      });
        
      $(document).bind(events.move, function(e) {
        for (var page in data.pages)
          if (has(page, data.pages))
            flipMethods._eventMove.call(data.pages[page], e);
      }).
      bind(events.end, function(e) {
        for (var page in data.pages)
          if (has(page, data.pages))
            flipMethods._eventEnd.call(data.pages[page], e);
  
      });
  
      data.done = true;
  
      return this;
    },
  
    // Adds a page from external data
  
    addPage: function(element, page) {
  
      var incPages = false,
        data = this.data(),
        lastPage = data.totalPages+1;
  
      if (page) {
        if (page==lastPage) {
          page = lastPage;
          incPages = true;
        } else if (page>lastPage)
          throw new Error ('It is impossible to add the page "'+page+'", the maximum value is: "'+lastPage+'"');
  
      } else {
        page = lastPage;
        incPages = true;
      }
  
      if (page>=1 && page<=lastPage) {
  
        // Stop animations
        if (data.done) this.turn('stop');
  
        // Move pages if it's necessary
        if (page in data.pageObjs)
          turnMethods._movePages.call(this, page, 1);
  
        // Update number of pages
        if (incPages)
          data.totalPages = lastPage;
  
        // Add element
        data.pageObjs[page] = $(element).addClass('turn-page p' + page);
  
        // Add page
        turnMethods._addPage.call(this, page);
  
        // Update view
        if (data.done)
          this.turn('update');
  
        turnMethods._removeFromDOM.call(this);
      }
  
      return this;
    },
  
    // Adds a page from internal data
  
    _addPage: function(page) {
      
      var data = this.data(),
        element = data.pageObjs[page];
  
      if (element)
        if (turnMethods._necessPage.call(this, page)) {
          
          if (!data.pageWrap[page]) {
  
            var pageWidth = (data.display=='double') ? this.width()/2 : this.width(),
              pageHeight = this.height();
  
            element.css({width:pageWidth, height:pageHeight});
  
            // Place
            data.pagePlace[page] = page;
  
            // Wrapper
            data.pageWrap[page] = $('<div/>', {'class': 'turn-page-wrapper',
                            page: page,
                            css: {position: 'absolute',
                            overflow: 'hidden',
                            width: pageWidth,
                            height: pageHeight}}).
                            css(pagePosition[(data.display=='double') ? page%2 : 0]);
  
            // Append to this
            this.append(data.pageWrap[page]);
  
            // Move data.pageObjs[page] (element) to wrapper
            data.pageWrap[page].prepend(data.pageObjs[page]);
          }
  
          // If the page is in the current view, create the flip effect
          if (!page || turnMethods._setPageLoc.call(this, page)==1)
            turnMethods._makeFlip.call(this, page);
          
        } else {
  
          // Place
          data.pagePlace[page] = 0;
  
          // Remove element from the DOM
          if (data.pageObjs[page])
            data.pageObjs[page].remove();
  
        }
  
    },
  
    // Checks if a page is in memory
    
    hasPage: function(page) {
  
      return page in this.data().pageObjs;
    
    },
  
    // Prepares the flip effect for a page
  
    _makeFlip: function(page) {
  
      var data = this.data();
  
      if (!data.pages[page] && data.pagePlace[page]==page) {
  
        var single = data.display=='single',
          even = page%2;
        
        data.pages[page] = data.pageObjs[page].
                  css({width: (single) ? this.width() : this.width()/2, height: this.height()}).
                  flip({page: page,
                    next: (single && page === data.totalPages) ? page -1 : ((even || single) ? page+1 : page-1),
                    turn: this,
                    duration: data.opts.duration,
                    acceleration : data.opts.acceleration,
                    corners: (single) ? 'all' : ((even) ? 'forward' : 'backward'),
                    backGradient: data.opts.gradients,
                    frontGradient: data.opts.gradients
                    }).
                    flip('disable', data.disabled).
                    bind('pressed', turnMethods._pressed).
                    bind('released', turnMethods._released).
                    bind('start', turnMethods._start).
                    bind('end', turnMethods._end).
                    bind('flip', turnMethods._flip);
      }
      return data.pages[page];
    },
  
    // Makes pages within a range
  
    _makeRange: function() {
  
      var page,
        data = this.data(),
        range = this.turn('range');
  
        for (page = range[0]; page<=range[1]; page++)
          turnMethods._addPage.call(this, page);
  
    },
  
    // Returns a range of `pagesInDOM` pages that should be in the DOM
    // Example:
    // - page of the current view, return true
    // * page is in the range, return true
    // 0 page is not in the range, return false
    //
    // 1 2-3 4-5 6-7 8-9 10-11 12-13
    //    **  **  --   **  **
  
    range: function(page) {
  
      var remainingPages, left, right,
        data = this.data();
        page = page || data.tpage || data.page;
        var view = turnMethods._view.call(this, page);
  
        if (page<1 || page>data.totalPages)
          throw new Error ('"'+page+'" is not a page for range');
      
        view[1] = view[1] || view[0];
        
        if (view[0]>=1 && view[1]<=data.totalPages) {
  
          remainingPages = Math.floor((pagesInDOM-2)/2);
  
          if (data.totalPages-view[1] > view[0]) {
            left = Math.min(view[0]-1, remainingPages);
            right = 2*remainingPages-left;
          } else {
            right = Math.min(data.totalPages-view[1], remainingPages);
            left = 2*remainingPages-right;
          }
  
        } else {
          left = pagesInDOM-1;
          right = pagesInDOM-1;
        }
  
        return [Math.max(1, view[0]-left), Math.min(data.totalPages, view[1]+right)];
  
    },
  
    // Detects if a page is within the range of `pagesInDOM` from the current view
  
    _necessPage: function(page) {
      
      if (page===0)
        return true;
  
      var range = this.turn('range');
  
      return page>=range[0] && page<=range[1];
      
    },
  
    // Releases memory by removing pages from the DOM
  
    _removeFromDOM: function() {
  
      var page, data = this.data();
  
      for (page in data.pageWrap)
        if (has(page, data.pageWrap) && !turnMethods._necessPage.call(this, page))
          turnMethods._removePageFromDOM.call(this, page);
      
  
    },
  
    // Removes a page from DOM and its internal references
  
    _removePageFromDOM: function(page) {
  
      var data = this.data();
  
      if (data.pages[page]) {
        var dd = data.pages[page].data();
        if (dd.f && dd.f.fwrapper)
          dd.f.fwrapper.remove();
        data.pages[page].remove();
        delete data.pages[page];
      }
  
      if (data.pageObjs[page])
        data.pageObjs[page].remove();
  
      if (data.pageWrap[page]) {
        data.pageWrap[page].remove();
        delete data.pageWrap[page];
      }
  
      delete data.pagePlace[page];
  
    },
  
    // Removes a page
  
    removePage: function(page) {
  
      var data = this.data();
  
      if (data.pageObjs[page]) {
        // Stop animations
        this.turn('stop');
  
        // Remove `page`
        turnMethods._removePageFromDOM.call(this, page);
        delete data.pageObjs[page];
  
        // Move the pages behind `page`
        turnMethods._movePages.call(this, page, -1);
  
        // Resize the size of this magazine
        data.totalPages = data.totalPages-1;
        turnMethods._makeRange.call(this);
  
        // Check the current view
        if (data.page>data.totalPages)
          this.turn('page', data.totalPages);
      }
  
      return this;
    
    },
  
    // Moves pages
  
    _movePages: function(from, change) {
  
      var page,
        data = this.data(),
        single = data.display=='single',
        move = function(page) {
  
          var next = page + change,
            odd = next%2;
  
          if (data.pageObjs[page])
            data.pageObjs[next] = data.pageObjs[page].removeClass('page' + page).addClass('page' + next);
  
          if (data.pagePlace[page] && data.pageWrap[page]) {
            data.pagePlace[next] = next;
            data.pageWrap[next] = data.pageWrap[page].css(pagePosition[(single) ? 0 : odd]).attr('page', next);
            
            if (data.pages[page])
              data.pages[next] = data.pages[page].flip('options', {
                page: next,
                next: (single || odd) ? next+1 : next-1,
                corners: (single) ? 'all' : ((odd) ? 'forward' : 'backward')
              });
  
            if (change) {
              delete data.pages[page];
              delete data.pagePlace[page];
              delete data.pageObjs[page];
              delete data.pageWrap[page];
              delete data.pageObjs[page];
            }
        }
      };
  
      if (change>0)
        for (page=data.totalPages; page>=from; page--) move(page);
      else
        for (page=from; page<=data.totalPages; page++) move(page);
  
    },
  
    // Sets or Gets the display mode
  
    display: function(display) {
  
      var data = this.data(),
        currentDisplay = data.display;
  
      if (display) {
  
        if ($.inArray(display, displays)==-1)
          throw new Error ('"'+display + '" is not a value for display');
        
        if (display=='single') {
          if (!data.pageObjs[0]) {
            this.turn('stop').
              css({'overflow': 'hidden'});
            data.pageObjs[0] = $('<div />', {'class': 'turn-page p-temporal'}).
                    css({width: this.width(), height: this.height()}).
                      appendTo(this);
          }
        } else {
          if (data.pageObjs[0]) {
            this.turn('stop').
              css({'overflow': ''});
            data.pageObjs[0].remove();
            delete data.pageObjs[0];
          }
        }
  
        data.display = display;
  
        if (currentDisplay) {
          var size = this.turn('size');
          turnMethods._movePages.call(this, 1, 0);
          this.turn('size', size.width, size.height).
              turn('update');
        }
  
        return this;
  
      } else
        return currentDisplay;
    
    },
  
    // Detects if the pages are being animated
  
    animating: function() {
  
      return this.data().pageMv.length>0;
  
    },
  
    // Disables and enables the effect
  
    disable: function(bool) {
  
      var page,
        data = this.data(),
        view = this.turn('view');
  
        data.disabled = bool===undefined || bool===true;
  
      for (page in data.pages)
        if (has(page, data.pages))
          data.pages[page].flip('disable', bool ? $.inArray(page, view) : false );
  
      return this;
  
    },
  
    // Gets and sets the size
  
    size: function(width, height) {
  
      if (width && height) {
  
        var data = this.data(), pageWidth = (data.display=='double') ? width/2 : width, page;
  
        this.css({width: width, height: height});
  
        if (data.pageObjs[0])
          data.pageObjs[0].css({width: pageWidth, height: height});
        
        for (page in data.pageWrap) {
          if (!has(page, data.pageWrap)) continue;
          data.pageObjs[page].css({width: pageWidth, height: height});
          data.pageWrap[page].css({width: pageWidth, height: height});
          if (data.pages[page])
            data.pages[page].css({width: pageWidth, height: height});
        }
  
        this.turn('resize');
  
        return this;
  
      } else {
        
        return {width: this.width(), height: this.height()};
  
      }
    },
  
    // Resizes each page
  
    resize: function() {
  
      var page, data = this.data();
  
      if (data.pages[0]) {
        data.pageWrap[0].css({left: -this.width()});
        data.pages[0].flip('resize', true);
      }
  
      for (page = 1; page <= data.totalPages; page++)
        if (data.pages[page])
          data.pages[page].flip('resize', true);
  
  
    },
  
    // Removes an animation from the cache
  
    _removeMv: function(page) {
  
      var i, data = this.data();
        
      for (i=0; i<data.pageMv.length; i++)
        if (data.pageMv[i]==page) {
          data.pageMv.splice(i, 1);
          return true;
        }
  
      return false;
  
    },
  
    // Adds an animation to the cache
    
    _addMv: function(page) {
  
      var data = this.data();
  
      turnMethods._removeMv.call(this, page);
      data.pageMv.push(page);
  
    },
  
    // Gets indexes for a view
  
    _view: function(page) {
    
      var data = this.data();
      page = page || data.page;
  
      if (data.display=='double')
        return (page%2) ? [page-1, page] : [page, page+1];
      else
        return [page];
  
    },
  
    // Gets a view
  
    view: function(page) {
  
      var data = this.data(), view = turnMethods._view.call(this, page);
  
      return (data.display=='double') ? [(view[0]>0) ? view[0] : 0, (view[1]<=data.totalPages) ? view[1] : 0]
          : [(view[0]>0 && view[0]<=data.totalPages) ? view[0] : 0];
  
    },
  
    // Stops animations
  
    stop: function(ok) {
  
      var i, opts, data = this.data(), pages = data.pageMv;
  
      data.pageMv = [];
  
      if (data.tpage) {
        data.page = data.tpage;
        delete data['tpage'];
      }
  
      for (i in pages) {
        if (!has(i, pages)) continue;
        opts = data.pages[pages[i]].data().f.opts;
        flipMethods._moveFoldingPage.call(data.pages[pages[i]], null);
        data.pages[pages[i]].flip('hideFoldedPage');
        data.pagePlace[opts.next] = opts.next;
        
        if (opts.force) {
          opts.next = (opts.page%2===0) ? opts.page-1 : opts.page+1;
          delete opts['force'];
        }
  
      }
  
      this.turn('update');
  
      return this;
    },
  
    // Gets and sets the number of pages
  
    pages: function(pages) {
  
      var data = this.data();
  
      if (pages) {
        if (pages<data.totalPages) {
  
          for (var page = pages+1; page<=data.totalPages; page++)
            this.turn('removePage', page);
  
          if (this.turn('page')>pages)
            this.turn('page', pages);
        }
  
        data.totalPages = pages;
  
        return this;
      } else
        return data.totalPages;
  
    },
  
    // Sets a page without effect
  
    _fitPage: function(page, ok) {
      
      var data = this.data(), newView = this.turn('view', page);
      
      if (data.page!=page) {
        this.trigger('turning', [page, newView]);
        if ($.inArray(1, newView)!=-1) this.trigger('first');
        if ($.inArray(data.totalPages, newView)!=-1) this.trigger('last');
      }
  
      if (!data.pageObjs[page])
        return;
  
      data.tpage = page;
  
      this.turn('stop', ok);
      turnMethods._removeFromDOM.call(this);
      turnMethods._makeRange.call(this);
      this.trigger('turned', [page, newView]);
  
    },
    
    // Turns to a page
  
    _turnPage: function(page) {
  
      var current, next,
        data = this.data(),
        view = this.turn('view'),
        newView = this.turn('view', page);
    
      if (data.page!=page) {
        this.trigger('turning', [page, newView]);
        if ($.inArray(1, newView)!=-1) this.trigger('first');
        if ($.inArray(data.totalPages, newView)!=-1) this.trigger('last');
      }
  
      if (!data.pageObjs[page])
        return;
  
      data.tpage = page;
  
      this.turn('stop');
  
      turnMethods._makeRange.call(this);
  
      if (data.display=='single') {
        current = view[0];
        next = newView[0];
      } else if (view[1] && page>view[1]) {
        current = view[1];
        next = newView[0];
      } else if (view[0] && page<view[0]) {
        current = view[0];
        next = newView[1];
      }
  
      if (data.pages[current]) {
  
        var opts = data.pages[current].data().f.opts;
        data.tpage = next;
        
        if (opts.next!=next) {
          opts.next = next;
          data.pagePlace[next] = opts.page;
          opts.force = true;
        }
  
        if (data.display=='single')
          data.pages[current].flip('turnPage', (newView[0] > view[0]) ? 'br' : 'bl');
        else
          data.pages[current].flip('turnPage');
      }
  
    },
  
    // Gets and sets a page
  
    page: function(page) {
  
      page = parseInt(page, 10);
  
      var data = this.data();
  
      if (page>0 && page<=data.totalPages) {
        if (!data.done || $.inArray(page, this.turn('view'))!=-1)
          turnMethods._fitPage.call(this, page);
        else
          turnMethods._turnPage.call(this, page);
      
        return this;
  
      } else
        return data.page;
    
    },
  
    // Turns to the next view
  
    next: function() {
  
      var data = this.data();
      return this.turn('page', turnMethods._view.call(this, data.page).pop() + 1);
    
    },
  
    // Turns to the previous view
  
    previous: function() {
      
      var data = this.data();
      return this.turn('page', turnMethods._view.call(this, data.page).shift() - 1);
  
    },
  
    // Adds a motion to the internal list
  
    _addMotionPage: function() {
  
      var opts = $(this).data().f.opts,
        turn = opts.turn,
        dd = turn.data();
  
      opts.pageMv = opts.page;
      turnMethods._addMv.call(turn, opts.pageMv);
      dd.pagePlace[opts.next] = opts.page;
      turn.turn('update');
  
    },
  
    // This event is called in context of flip
  
    _start: function(e, opts, corner) {
  
        var data = opts.turn.data(),
          event = $.Event('start');
  
        e.stopPropagation();
  
        opts.turn.trigger(event, [opts, corner]);
  
        if (event.isDefaultPrevented()) {
          e.preventDefault();
          return;
        }
      
      if (data.display=='single') {
  
        var left = corner.charAt(1)=='l';
        if ((opts.page==1 && left) || (opts.page==data.totalPages && !left))
          e.preventDefault();
        else {
          if (left) {
            opts.next = (opts.next<opts.page) ? opts.next : opts.page-1;
            opts.force = true;
          } else
            opts.next = (opts.next>opts.page) ? opts.next : opts.page+1;
        }
  
      }
  
      turnMethods._addMotionPage.call(this);
    },
  
    // This event is called in context of flip
  
    _end: function(e, turned) {
      
      var that = $(this),
        data = that.data().f,
        opts = data.opts,
        turn = opts.turn,
        dd = turn.data();
  
      e.stopPropagation();
  
      if (turned || dd.tpage) {
  
        if (dd.tpage==opts.next || dd.tpage==opts.page) {
          delete dd['tpage'];
          turnMethods._fitPage.call(turn, dd.tpage || opts.next, true);
        }
  
      } else {
        turnMethods._removeMv.call(turn, opts.pageMv);
        turn.turn('update');
      }
      
    },
    
    // This event is called in context of flip
  
    _pressed: function() {
  
      var page,
        that = $(this),
        data = that.data().f,
        turn = data.opts.turn,
        pages = turn.data().pages;
    
      for (page in pages)
        if (page!=data.opts.page)
          pages[page].flip('disable', true);
  
      return data.time = new Date().getTime();
  
    },
  
    // This event is called in context of flip
  
    _released: function(e, point) {
      
      var that = $(this),
        data = that.data().f;
  
        e.stopPropagation();
  
      if ((new Date().getTime())-data.time<200 || point.x<0 || point.x>$(this).width()) {
        e.preventDefault();
        data.opts.turn.data().tpage = data.opts.next;
        data.opts.turn.turn('update');
        $(that).flip('turnPage');
      }
  
    },
  
    // This event is called in context of flip
    
    _flip: function() {
  
      var opts = $(this).data().f.opts;
  
      opts.turn.trigger('turn', [opts.next]);
  
    },
  
    // Calculate the z-index value for pages during the animation
  
    calculateZ: function(mv) {
  
      var i, page, nextPage, placePage, dpage,
        that = this,
        data = this.data(),
        view = this.turn('view'),
        currentPage = view[0] || view[1],
        r = {pageZ: {}, partZ: {}, pageV: {}},
  
        addView = function(page) {
          var view = that.turn('view', page);
          if (view[0]) r.pageV[view[0]] = true;
          if (view[1]) r.pageV[view[1]] = true;
        };
      
        for (i = 0; i<mv.length; i++) {
          page = mv[i];
          nextPage = data.pages[page].data().f.opts.next;
          placePage = data.pagePlace[page];
          addView(page);
          addView(nextPage);
          dpage = (data.pagePlace[nextPage]==nextPage) ? nextPage : page;
          r.pageZ[dpage] = data.totalPages - Math.abs(currentPage-dpage);
          r.partZ[placePage] = data.totalPages*2 + Math.abs(currentPage-dpage);
        }
  
      return r;
    },
  
    // Updates the z-index and display property of every page
  
    update: function() {
  
      var page,
        data = this.data();
  
      if (data.pageMv.length && data.pageMv[0]!==0) {
  
        // Update motion
  
        var apage,
          pos = this.turn('calculateZ', data.pageMv),
          view = this.turn('view', data.tpage);
      
        if (data.pagePlace[view[0]]==view[0]) apage = view[0];
        else if (data.pagePlace[view[1]]==view[1]) apage = view[1];
      
        for (page in data.pageWrap) {
  
          if (!has(page, data.pageWrap)) continue;
  
          data.pageWrap[page].css({display: (pos.pageV[page]) ? '' : 'none', 'z-index': pos.pageZ[page] || 0});
  
          if (data.pages[page]) {
            data.pages[page].flip('z', pos.partZ[page] || null);
  
            if (pos.pageV[page])
              data.pages[page].flip('resize');
  
            if (data.tpage)
              data.pages[page].flip('disable', true); // data.disabled || page!=apage
          }
        }
          
      } else {
  
        // Update static pages
  
        for (page in data.pageWrap) {
          if (!has(page, data.pageWrap)) continue;
            var pageLocation = turnMethods._setPageLoc.call(this, page);
            if (data.pages[page])
              data.pages[page].flip('disable', data.disabled || pageLocation!=1).flip('z', null);
        }
      }
    },
  
    // Sets the z-index and display property of a page
    // It depends on the current view
  
    _setPageLoc: function(page) {
  
      var data = this.data(),
        view = this.turn('view');
  
      if (page==view[0] || page==view[1]) {
        data.pageWrap[page].css({'z-index': data.totalPages, display: ''});
        return 1;
      } else if ((data.display=='single' && page==view[0]+1) || (data.display=='double' && page==view[0]-2 || page==view[1]+2)) {
        data.pageWrap[page].css({'z-index': data.totalPages-1, display: ''});
        return 2;
      } else {
        data.pageWrap[page].css({'z-index': 0, display: 'none'});
        return 0;
      }
    }
  },
  
  // Methods and properties for the flip page effect
  
  flipMethods = {
  
    // Constructor
  
    init: function(opts) {
  
      if (opts.gradients) {
        opts.frontGradient = true;
        opts.backGradient = true;
      }
  
      this.data({f: {}});
      this.flip('options', opts);
  
      flipMethods._addPageWrapper.call(this);
  
      return this;
    },
  
    setData: function(d) {
      
      var data = this.data();
  
      data.f = $.extend(data.f, d);
  
      return this;
    },
  
    options: function(opts) {
      
      var data = this.data().f;
  
      if (opts) {
        flipMethods.setData.call(this, {opts: $.extend({}, data.opts || flipOptions, opts) });
        return this;
      } else
        return data.opts;
  
    },
  
    z: function(z) {
  
      var data = this.data().f;
      data.opts['z-index'] = z;
      data.fwrapper.css({'z-index': z || parseInt(data.parent.css('z-index'), 10) || 0});
  
      return this;
    },
  
    _cAllowed: function() {
  
      return corners[this.data().f.opts.corners] || this.data().f.opts.corners;
  
    },
  
    _cornerActivated: function(e) {
      if (e.originalEvent === undefined) {
        return false;
      }		
  
      e = (isTouch) ? e.originalEvent.touches : [e];
  
      var data = this.data().f,
        pos = data.parent.offset(),
        width = this.width(),
        height = this.height(),
        c = {x: Math.max(0, e[0].pageX-pos.left), y: Math.max(0, e[0].pageY-pos.top)},
        csz = data.opts.cornerSize,
        allowedCorners = flipMethods._cAllowed.call(this);
  
        if (c.x<=0 || c.y<=0 || c.x>=width || c.y>=height) return false;
  
        if (c.y<csz) c.corner = 't';
        else if (c.y>=height-csz) c.corner = 'b';
        else return false;
        
        if (c.x<=csz) c.corner+= 'l';
        else if (c.x>=width-csz) c.corner+= 'r';
        else return false;
  
      return ($.inArray(c.corner, allowedCorners)==-1) ? false : c;
  
    },
  
    _c: function(corner, opts) {
  
      opts = opts || 0;
      return ({tl: point2D(opts, opts),
          tr: point2D(this.width()-opts, opts),
          bl: point2D(opts, this.height()-opts),
          br: point2D(this.width()-opts, this.height()-opts)})[corner];
  
    },
  
    _c2: function(corner) {
  
      return {tl: point2D(this.width()*2, 0),
          tr: point2D(-this.width(), 0),
          bl: point2D(this.width()*2, this.height()),
          br: point2D(-this.width(), this.height())}[corner];
  
    },
  
    _foldingPage: function(corner) {
  
      var opts = this.data().f.opts;
      
      if (opts.folding) return opts.folding;
      else if(opts.turn) {
        var data = opts.turn.data();
        if (data.display == 'single')
          return (data.pageObjs[opts.next]) ? data.pageObjs[0] : null;
        else
          return data.pageObjs[opts.next];
      }
  
    },
  
    _backGradient: function() {
  
      var data =	this.data().f,
        turn = data.opts.turn,
        gradient = data.opts.backGradient &&
              (!turn || turn.data().display=='single' || (data.opts.page!=2 && data.opts.page!=turn.data().totalPages-1) );
  
  
      if (gradient && !data.bshadow)
        data.bshadow = $('<div/>', divAtt(0, 0, 1)).
          css({'position': '', width: this.width(), height: this.height()}).
            appendTo(data.parent);
  
      return gradient;
  
    },
  
    resize: function(full) {
      
      var data = this.data().f,
        width = this.width(),
        height = this.height(),
        size = Math.round(Math.sqrt(Math.pow(width, 2)+Math.pow(height, 2)));
  
      if (full) {
        data.wrapper.css({width: size, height: size});
        data.fwrapper.css({width: size, height: size}).
          children(':first-child').
            css({width: width, height: height});
  
        data.fpage.css({width: height, height: width});
  
        if (data.opts.frontGradient)
          data.ashadow.css({width: height, height: width});
  
        if (flipMethods._backGradient.call(this))
          data.bshadow.css({width: width, height: height});
      }
  
      if (data.parent.is(':visible')) {
        data.fwrapper.css({top: data.parent.offset().top,
          left: data.parent.offset().left});
  
        if (data.opts.turn)
          data.fparent.css({top: -data.opts.turn.offset().top, left: -data.opts.turn.offset().left});
      }
  
      this.flip('z', data.opts['z-index']);
  
    },
  
    // Prepares the page by adding a general wrapper and another objects
  
    _addPageWrapper: function() {
  
      var att,
        data = this.data().f,
        parent = this.parent();
  
      if (!data.wrapper) {
  
        var left = this.css('left'),
          top = this.css('top'),
          width = this.width(),
          height = this.height(),
          size = Math.round(Math.sqrt(Math.pow(width, 2)+Math.pow(height, 2)));
        
        data.parent = parent;
        data.fparent = (data.opts.turn) ? data.opts.turn.data().fparent : $('#turn-fwrappers');
  
        if (!data.fparent) {
          var fparent = $('<div/>', {css: {'pointer-events': 'none'}}).hide();
            fparent.data().flips = 0;
  
          if (data.opts.turn) {
            fparent.css(divAtt(-data.opts.turn.offset().top, -data.opts.turn.offset().left, 'auto', 'visible').css).
                appendTo(data.opts.turn);
            
            data.opts.turn.data().fparent = fparent;
          } else {
            fparent.css(divAtt(0, 0, 'auto', 'visible').css).
              attr('id', 'turn-fwrappers').
                appendTo($('body'));
          }
  
          data.fparent = fparent;
        }
  
        this.css({position: 'absolute', top: 0, left: 0, bottom: 'auto', right: 'auto'});
  
        data.wrapper = $('<div/>', divAtt(0, 0, this.css('z-index'))).
                  appendTo(parent).
                    prepend(this);
  
        data.fwrapper = $('<div/>', divAtt(parent.offset().top, parent.offset().left)).
                  hide().
                    appendTo(data.fparent);
  
        data.fpage = $('<div/>', {css: {cursor: 'default'}}).
            appendTo($('<div/>', divAtt(0, 0, 0, 'visible')).
                  appendTo(data.fwrapper));
  
        if (data.opts.frontGradient)
          data.ashadow = $('<div/>', divAtt(0, 0,  1)).
            appendTo(data.fpage);
  
        // Save data
  
        flipMethods.setData.call(this, data);
  
        // Set size
        flipMethods.resize.call(this, true);
      }
  
    },
  
    // Takes a 2P point from the screen and applies the transformation
  
    _fold: function(point) {
  
      var that = this,
        a = 0,
        alpha = 0,
        beta,
        px,
        gradientEndPointA,
        gradientEndPointB,
        gradientStartV,
        gradientSize,
        gradientOpacity,
        mv = point2D(0, 0),
        df = point2D(0, 0),
        tr = point2D(0, 0),
        width = this.width(),
        height = this.height(),
        folding = flipMethods._foldingPage.call(this),
        tan = Math.tan(alpha),
        data = this.data().f,
        ac = data.opts.acceleration,
        h = data.wrapper.height(),
        o = flipMethods._c.call(this, point.corner),
        top = point.corner.substr(0, 1) == 't',
        left = point.corner.substr(1, 1) == 'l',
  
        compute = function() {
          var rel = point2D((o.x) ? o.x - point.x : point.x, (o.y) ? o.y - point.y : point.y),
            tan = (Math.atan2(rel.y, rel.x)),
            middle;
  
          alpha = A90 - tan;
          a = deg(alpha);
          middle = point2D((left) ? width - rel.x/2 : point.x + rel.x/2, rel.y/2);
  
          var gamma = alpha - Math.atan2(middle.y, middle.x),
            distance =  Math.max(0, Math.sin(gamma) * Math.sqrt(Math.pow(middle.x, 2) + Math.pow(middle.y, 2)));
  
            tr = point2D(distance * Math.sin(alpha), distance * Math.cos(alpha));
  
            if (alpha > A90) {
            
              tr.x = tr.x + Math.abs(tr.y * Math.tan(tan));
              tr.y = 0;
  
              if (Math.round(tr.x*Math.tan(PI-alpha)) < height) {
  
                point.y = Math.sqrt(Math.pow(height, 2)+2 * middle.x * rel.x);
                if (top) point.y =  height - point.y;
                return compute();
  
              }
            }
        
          if (alpha>A90) {
            var beta = PI-alpha, dd = h - height/Math.sin(beta);
            mv = point2D(Math.round(dd*Math.cos(beta)), Math.round(dd*Math.sin(beta)));
            if (left) mv.x = - mv.x;
            if (top) mv.y = - mv.y;
          }
  
          px = Math.round(tr.y/Math.tan(alpha) + tr.x);
        
          var side = width - px,
            sideX = side*Math.cos(alpha*2),
            sideY = side*Math.sin(alpha*2);
            df = point2D(Math.round( (left ? side -sideX : px+sideX)), Math.round((top) ? sideY : height - sideY));
            
          
          // GRADIENTS
  
            gradientSize = side*Math.sin(alpha);
              var endingPoint = flipMethods._c2.call(that, point.corner),
              far = Math.sqrt(Math.pow(endingPoint.x-point.x, 2)+Math.pow(endingPoint.y-point.y, 2));
  
            gradientOpacity = (far<width) ? far/width : 1;
  
  
          if (data.opts.frontGradient) {
  
            gradientStartV = gradientSize>100 ? (gradientSize-100)/gradientSize : 0;
            gradientEndPointA = point2D(gradientSize*Math.sin(A90-alpha)/height*100, gradientSize*Math.cos(A90-alpha)/width*100);
          
            if (top) gradientEndPointA.y = 100-gradientEndPointA.y;
            if (left) gradientEndPointA.x = 100-gradientEndPointA.x;
          }
  
          if (flipMethods._backGradient.call(that)) {
  
            gradientEndPointB = point2D(gradientSize*Math.sin(alpha)/width*100, gradientSize*Math.cos(alpha)/height*100);
            if (!left) gradientEndPointB.x = 100-gradientEndPointB.x;
            if (!top) gradientEndPointB.y = 100-gradientEndPointB.y;
          }
          //
  
          tr.x = Math.round(tr.x);
          tr.y = Math.round(tr.y);
  
          return true;
        },
  
        transform = function(tr, c, x, a) {
        
          var f = ['0', 'auto'], mvW = (width-h)*x[0]/100, mvH = (height-h)*x[1]/100,
            v = {left: f[c[0]], top: f[c[1]], right: f[c[2]], bottom: f[c[3]]},
            aliasingFk = (a!=90 && a!=-90) ? (left ? -1 : 1) : 0;
  
            x = x[0] + '% ' + x[1] + '%';
  
          that.css(v).transform(rotate(a) + translate(tr.x + aliasingFk, tr.y, ac), x);
  
          data.fpage.parent().css(v);
          data.wrapper.transform(translate(-tr.x + mvW-aliasingFk, -tr.y + mvH, ac) + rotate(-a), x);
  
          data.fwrapper.transform(translate(-tr.x + mv.x + mvW, -tr.y + mv.y + mvH, ac) + rotate(-a), x);
          data.fpage.parent().transform(rotate(a) + translate(tr.x + df.x - mv.x, tr.y + df.y - mv.y, ac), x);
  
          if (data.opts.frontGradient)
            gradient(data.ashadow,
                point2D(left?100:0, top?100:0),
                point2D(gradientEndPointA.x, gradientEndPointA.y),
                [[gradientStartV, 'rgba(0,0,0,0)'],
                [((1-gradientStartV)*0.8)+gradientStartV, 'rgba(0,0,0,'+(0.2*gradientOpacity)+')'],
                [1, 'rgba(255,255,255,'+(0.2*gradientOpacity)+')']],
                3,
                alpha);
      
          if (flipMethods._backGradient.call(that))
            gradient(data.bshadow,
                point2D(left?0:100, top?0:100),
                point2D(gradientEndPointB.x, gradientEndPointB.y),
                [[0.8, 'rgba(0,0,0,0)'],
                [1, 'rgba(0,0,0,'+(0.3*gradientOpacity)+')'],
                [1, 'rgba(0,0,0,0)']],
                3);
          
        };
  
      switch (point.corner) {
        case 'tl' :
          point.x = Math.max(point.x, 1);
          compute();
          transform(tr, [1,0,0,1], [100, 0], a);
          data.fpage.transform(translate(-height, -width, ac) + rotate(90-a*2) , '100% 100%');
          folding.transform(rotate(90) + translate(0, -height, ac), '0% 0%');
        break;
        case 'tr' :
          point.x = Math.min(point.x, width-1);
          compute();
          transform(point2D(-tr.x, tr.y), [0,0,0,1], [0, 0], -a);
          data.fpage.transform(translate(0, -width, ac) + rotate(-90+a*2) , '0% 100%');
          folding.transform(rotate(270) + translate(-width, 0, ac), '0% 0%');
        break;
        case 'bl' :
          point.x = Math.max(point.x, 1);
          compute();
          transform(point2D(tr.x, -tr.y), [1,1,0,0], [100, 100], -a);
          data.fpage.transform(translate(-height, 0, ac) + rotate(-90+a*2), '100% 0%');
          folding.transform(rotate(270) + translate(-width, 0, ac), '0% 0%');
        break;
        case 'br' :
          point.x = Math.min(point.x, width-1);
          compute();
          transform(point2D(-tr.x, -tr.y), [0,1,1,0], [0, 100], a);
          data.fpage.transform(rotate(90-a*2), '0% 0%');
          folding.transform(rotate(90) + translate(0, -height, ac), '0% 0%');
  
        break;
      }
  
      data.point = point;
    
    },
  
    _moveFoldingPage: function(bool) {
  
      var data = this.data().f,
        folding = flipMethods._foldingPage.call(this);
  
      if (folding) {
        if (bool) {
          if (!data.fpage.children()[data.ashadow? '1' : '0']) {
            flipMethods.setData.call(this, {backParent: folding.parent()});
            data.fpage.prepend(folding);
          }
        } else {
          if (data.backParent)
            data.backParent.prepend(folding);
  
        }
      }
  
    },
  
    _showFoldedPage: function(c, animate) {
  
      var folding = flipMethods._foldingPage.call(this),
        dd = this.data(),
        data = dd.f;
  
      if (!data.point || data.point.corner!=c.corner) {
        var event = $.Event('start');
        this.trigger(event, [data.opts, c.corner]);
  
        if (event.isDefaultPrevented())
          return false;
      }
  
  
      if (folding) {
  
        if (animate) {
  
          var that = this, point = (data.point && data.point.corner==c.corner) ? data.point : flipMethods._c.call(this, c.corner, 1);
        
          this.animatef({from: [point.x, point.y], to:[c.x, c.y], duration: 500, frame: function(v) {
            c.x = Math.round(v[0]);
            c.y = Math.round(v[1]);
            flipMethods._fold.call(that, c);
          }});
  
        } else	{
  
          flipMethods._fold.call(this, c);
          if (dd.effect && !dd.effect.turning)
            this.animatef(false);
  
        }
  
        if (!data.fwrapper.is(':visible')) {
          data.fparent.show().data().flips++;
          flipMethods._moveFoldingPage.call(this, true);
          data.fwrapper.show();
  
          if (data.bshadow)
            data.bshadow.show();
        }
  
        return true;
      }
  
      return false;
    },
  
    hide: function() {
  
      var data = this.data().f,
        folding = flipMethods._foldingPage.call(this);
  
      if ((--data.fparent.data().flips)===0)
        data.fparent.hide();
  
      this.css({left: 0, top: 0, right: 'auto', bottom: 'auto'}).transform('', '0% 100%');
  
      data.wrapper.transform('', '0% 100%');
  
      data.fwrapper.hide();
  
      if (data.bshadow)
        data.bshadow.hide();
  
      folding.transform('', '0% 0%');
  
      return this;
    },
  
    hideFoldedPage: function(animate) {
  
      var data = this.data().f;
  
      if (!data.point) return;
  
      var that = this,
        p1 = data.point,
        hide = function() {
          data.point = null;
          that.flip('hide');
          that.trigger('end', [false]);
        };
  
      if (animate) {
        var p4 = flipMethods._c.call(this, p1.corner),
          top = (p1.corner.substr(0,1)=='t'),
          delta = (top) ? Math.min(0, p1.y-p4.y)/2 : Math.max(0, p1.y-p4.y)/2,
          p2 = point2D(p1.x, p1.y+delta),
          p3 = point2D(p4.x, p4.y-delta);
      
        this.animatef({
          from: 0,
          to: 1,
          frame: function(v) {
            var np = bezier(p1, p2, p3, p4, v);
            p1.x = np.x;
            p1.y = np.y;
            flipMethods._fold.call(that, p1);
          },
          complete: hide,
          duration: 800,
          hiding: true
          });
  
      } else {
        this.animatef(false);
        hide();
      }
    },
  
    turnPage: function(corner) {
  
      var that = this,
        data = this.data().f;
  
      corner = {corner: (data.corner) ? data.corner.corner : corner || flipMethods._cAllowed.call(this)[0]};
  
      var p1 = data.point || flipMethods._c.call(this, corner.corner, (data.opts.turn) ? data.opts.turn.data().opts.elevation : 0),
        p4 = flipMethods._c2.call(this, corner.corner);
  
        this.trigger('flip').
          animatef({
            from: 0,
            to: 1,
            frame: function(v) {
              var np = bezier(p1, p1, p4, p4, v);
              corner.x = np.x;
              corner.y = np.y;
              flipMethods._showFoldedPage.call(that, corner);
            },
            
            complete: function() {
              that.trigger('end', [true]);
            },
            duration: data.opts.duration,
            turning: true
          });
  
        data.corner = null;
    },
  
    moving: function() {
  
      return 'effect' in this.data();
    
    },
  
    isTurning: function() {
  
      return this.flip('moving') && this.data().effect.turning;
    
    },
  
    _eventStart: function(e) {
  
      var data = this.data().f;
  
      if (!data.disabled && !this.flip('isTurning')) {
        data.corner = flipMethods._cornerActivated.call(this, e);
        if (data.corner && flipMethods._foldingPage.call(this, data.corner)) {
          flipMethods._moveFoldingPage.call(this, true);
          this.trigger('pressed', [data.point]);
          return false;
        } else
          data.corner = null;
      }
  
    },
  
    _eventMove: function(e) {
  
      var data = this.data().f;
  
      if (!data.disabled) {
        e = (isTouch) ? e.originalEvent.touches : [e];
      
        if (data.corner) {
  
          var pos = data.parent.offset();
  
          data.corner.x = e[0].pageX-pos.left;
          data.corner.y = e[0].pageY-pos.top;
  
          flipMethods._showFoldedPage.call(this, data.corner);
        
        } else if (!this.data().effect && this.is(':visible')) { // roll over
          
          var corner = flipMethods._cornerActivated.call(this, e[0]);
          if (corner) {
            var origin = flipMethods._c.call(this, corner.corner, data.opts.cornerSize/2);
            corner.x = origin.x;
            corner.y = origin.y;
            flipMethods._showFoldedPage.call(this, corner, true);
          } else
            flipMethods.hideFoldedPage.call(this, true);
  
        }
      }
    },
  
    _eventEnd: function() {
  
      var data = this.data().f;
  
      if (!data.disabled && data.point) {
        var event = $.Event('released');
        this.trigger(event, [data.point]);
        if (!event.isDefaultPrevented())
          flipMethods.hideFoldedPage.call(this, true);
      }
  
      data.corner = null;
  
    },
  
    disable: function(disable) {
  
      flipMethods.setData.call(this, {'disabled': disable});
      return this;
  
    }
  },
  
  cla = function(that, methods, args) {
  
    if (!args[0] || typeof(args[0])=='object')
      return methods.init.apply(that, args);
    else if(methods[args[0]] && args[0].toString().substr(0, 1)!='_')
      return methods[args[0]].apply(that, Array.prototype.slice.call(args, 1));
    else
      throw args[0] + ' is an invalid value';
  };
  
  $.extend($.fn, {
  
    flip: function(req, opts) {
      return cla(this, flipMethods, arguments);
    },
  
    turn: function(req) {
      return cla(this, turnMethods, arguments);
    },
  
    transform: function(transform, origin) {
  
      var properties = {};
      
      if (origin)
        properties[vendor+'transform-origin'] = origin;
      
      properties[vendor+'transform'] = transform;
    
      return this.css(properties);
  
    },
  
    animatef: function(point) {
  
      var data = this.data();
  
      if (data.effect)
        clearInterval(data.effect.handle);
  
      if (point) {
  
        if (!point.to.length) point.to = [point.to];
        if (!point.from.length) point.from = [point.from];
        if (!point.easing) point.easing = function (x, t, b, c, data) { return c * Math.sqrt(1 - (t=t/data-1)*t) + b; };
  
        var j, diff = [],
          len = point.to.length,
          that = this,
          fps = point.fps || 30,
          time = - fps,
          f = function() {
            var j, v = [];
            time = Math.min(point.duration, time + fps);
    
            for (j = 0; j < len; j++)
              v.push(point.easing(1, time, point.from[j], diff[j], point.duration));
  
            point.frame((len==1) ? v[0] : v);
  
            if (time==point.duration) {
              clearInterval(data.effect.handle);
              delete data['effect'];
              that.data(data);
              if (point.complete)
                point.complete();
              }
            };
  
        for (j = 0; j < len; j++)
          diff.push(point.to[j] - point.from[j]);
  
        data.effect = point;
        data.effect.handle = setInterval(f, fps);
        this.data(data);
        f();
      } else {
        delete data['effect'];
      }
    }
  });
  
  
  $.isTouch = isTouch;
  
  })(jQuery);